using System;
using System.Collections.Generic;
using System.Text;

namespace Utils
{
    public static class ExtensionMethods
    {
        public static TR MapValue<TK, TV, TR>(this Dictionary<TK, TV> dic, TK key, Func<TV, TR> found)
        {
            return dic.TryGetValue(key, out var value)
                ? found(value)
                : default;
        }

        public static TR MapValue<TK, TV, TR>(this Dictionary<TK, TV> dic, TK key, Func<TV, TR> found, Func<TR> notFound)
        {
            return dic.TryGetValue(key, out var value)
                ? found(value)
                : notFound();
        }

        public static void FilterChars(this StringBuilder sb, HashSet<char> chars, char replace = '_')
        {
            for (var i = 0; i < sb.Length; i++)
            {
                if (chars.Contains(sb[i])) sb[i] = replace;
            }
        }
    }
}